archive_source_sd_savedata: Add static method to get a specific save data path

src/core/file_sys/archive_source_sd_savedata.cpp

@@ -90,4 +90,9 @@ ResultVal<ArchiveFormatInfo> ArchiveSource_SDSaveData::GetFormatInfo(u64 program
     return MakeResult<ArchiveFormatInfo>(info);
 }
 
+std::string ArchiveSource_SDSaveData::GetSaveDataPathFor(const std::string& mount_point,
+                                                         u64 program_id) {
+    return GetSaveDataPath(GetSaveDataContainerPath(mount_point), program_id);
+}
+
 } // namespace FileSys

src/core/file_sys/archive_source_sd_savedata.h

@@ -23,6 +23,8 @@ public:
     ResultCode Format(u64 program_id, const FileSys::ArchiveFormatInfo& format_info);
     ResultVal<ArchiveFormatInfo> GetFormatInfo(u64 program_id) const;
 
+    static std::string GetSaveDataPathFor(const std::string& mount_point, u64 program_id);
+
 private:
     std::string mount_point;
 };